it sells a salty watermelon flavor in;q japan. >> no go. but i'm not going there. >> it's an acquired taste, i believe. >> putting tests to the test. >> open book, closed book? cheat sheet? one university study makes a surprising finding about the most effective way to learn. also ahead... all they want for christmas is a lot of cash. why this school district hopes that the mayor will agree. live in city hall, the story is ahead. >> i'm dan ashley. coming up at 5:00, kicking for a cause, bay area karate instructor who grew up in newtown, connecticut. he's finding a unique way to give back to family who's suffered such a great loss. and a simple way you can help a local school help find a campus garden. >> now, here is a lack at what is ahead on world news at 5:30. >> tonight on world news, there is a big backlash underway tonight against people profiting from selling assault weapons and chris kuomo brings us this story. including california teachers that want to pull investment funds out of investments like this. storms north of you. everyo